package com.example.Resizablecontrol;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * Created by 陈勇劲 on 2017/10/1.
 */

@SuppressLint("AppCompatCustomView")
public class ResizableImageView extends ImageView {

    public ResizableImageView(Context context){
        super(context);
    }

    public ResizableImageView(Context context, AttributeSet attrs){
        super(context,attrs);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec,int heightMeasureSpec){
        Drawable d=getDrawable();
        if (d!=null){
            int width=MeasureSpec.getSize(widthMeasureSpec);
            //高度根据使得图片充满屏幕计算而得
            int height=(int) Math.ceil((float) width*(float) d.getIntrinsicHeight()/(float) d.getIntrinsicWidth());
            setMeasuredDimension(width,height);
        }else{
            super.onMeasure(widthMeasureSpec,heightMeasureSpec);
        }
    }

}
